Among various types of transformers, the wound-core transformer has gradually become a research hotspot due to its unique structure and superior electromagnetic performance. Transformers generate noise during operation, primarily from the deformation of the core under the influence of alternating magnetic fields, which leads to vibration and noise. Therefore, this paper focuses on the simulation study of the magnetic field distribution and core vibration noise in wound-core transformers. The main content includes: First, establishing a 10 kV three-dimensional wound-core transformer and performing magnetic field calculations to determine the instantaneous flux density distribution on the core surface under rated conditions. Next, introducing a solid mechanics module, coupling the magnetic field with solid mechanics based on the magnetostrictive curve of the core to obtain the displacement distribution of the core. Finally, using the vibration nor-mal acceleration calculated by the solid mechanics module, further coupling it with an acoustic module to calculate the core vibration noise distribution map. The results show that the maximum displacement of the three-dimensional wound core is 10 × 10–5 mm, and the maximum noise level is around 45 dB.